Nenfabbik



July 2, 1929. F. LUTZ I 1.719.709

LOOPER ACTUATING MECHANISM FOR OVEREDGE SEWING MACHINES Filed June 6, 1927 '2 ShetS-Sheec 2 Patented July 2, 1929.

FRIEDRICH LUT'IZ, OF STUTTGART, GERMANY, ASSIGNOR TO UNION SPECIAL mom- NENFABRIK, G. M. B. 11., OF STUTTGART, GERMANY.

LOOPEB-ACTUATING MECHANISM FOR OVEREDGE SEWING MACHINES.

Application filed June 6, 1927, Serial No.

The invention relates to new and useful improvements in a looper actuating mechanism for an overedge sewing machine.

An object of the invention is to provide a sewing machine having a work support and a needle, with a looper mounted beneath the work support and movable above the work support for presenting a thread loop for the needle to enter, wherein'the looperis actu ated by a link directly connected at one end thereof to an arm supporting thelooper, and at its other end to an oscillating member for imparting endwise movements to the link, and wherein the link is so positioned as to move from one side of a line at right angles to the looper'arm to a position at the other side thereof.

A further object of the invention is to provide a machine of the above type wherein the looper carrying arm is mounted in a bracket which is adapted to be shifted bodily substantially at right angles to the line of feed for the producion of various seam widths.

A further object of the invention is to provide a looper actuatin mechanism of the above type wherein thfimrcket for supporting the loo er arm is capable of angular adjustment or cooperation with needles of varying diameters.

In the drawings which show by way of illustration one embodiment of the invention- Figure 1 is a view partly in section and partly in front elevation showing a portion of amachine having the improvements embodied therein;

Fig. 2 is'a view in plan of the same;

Fig. 3 isa transverse sectional View on the line 33 of Fig. 2;

Fig. 4 is a diagrammatic View showing the position of the looper arm and its actuating mechanism with the looper arm at both extreme positions of oscillation, and a Fig. 5 is a view similar to Fig. 4, but S1101 ing the parts in-full lines positioned at maximum thrust advantage.

The invention relates to overedge stitching machines wherein the needle thread is carried through the material adjacent the edge thereof, a looper thread is passed through said needle loop and is in turn enchained directly or indirectly with the next succeeding needle 100% above the fabric. The patents granted to arl Maier October 9, 1906, Nos. 833,074 and 833,075, show an overpartly insection andpartly- 196,965, and in Germany June 30, 1928.

edging machine of the type to which the present invention relates. has to doentirely with the support for the upper looper, that is, the looper which cooperates with the needle above the fabric, and the actuating mechanism therefor. A thread carrying looper is mounted at the outer end of an arm carried by a shaft which is supported in a bracket, and the bracket in turn is carried by a cylindrical arm mounted in a supporting bearing so that said arm may be adjusted endwise therein and the looper thus shifted in a direction subsantially at right angles to the line of feed or the edge of the material which is having the overedge thread loops attached thereto. This cylindrical supporting arm is also adapted to be turned in the supporting bearing, and thus the shaft carrying the arm supporting the thread carrying looper tilted, so as to position the looper for needles-of various diameters. The thread carrying looper isoscillated by a link which is directly connected to the arm supporting the thread carrying looper. The other end of the link it attached to an oscillating arm which is vibrated so as to impart endwise movement to the link. This oscillating arm for imparting movements to the looper, and the arm supporting the looper are so positioned that the link moves from a position at one side of a line at right angles to the length of the arm supporting the looper to the other side thereof, and thus it is that the best thrust advantage is obtained from the positioning of the parts.

eferring more in detail to-the drawings, the invention is shown as applied to a sewing machine having a work support 1. beneath which is located the main actuating shaft 2. A needle 19 is reciprocated in the usual way and is caused to penetrate the material back. from the edge thereof. Beneath the work support 1 is the usual form of thread carrying looper which enters the needle thread loop, and according to the present embodiment of the invention, the loop of the under looper thread is taken by the looper 14. Said looper is provided with .a notched end, and this notched or forked end is so positioned as to engage the loop of thread in the under looperand as the looper 14 is. oscillated, it moves to a osition over the work support and in front of the needle so that the needle on its next descent will pass through said loop in the looper thread. Instead of having the notched The present invention the path of the needle and means for clampmg said bracket in adjusted positions.

3. An overedge sewing machine including a work support, a needle, an over-edge looper, a bracket located beneath the work support, a shaft mounted in said bracket, an arm se-v cured to said shaft and carrying said looper, means for oscillatin said shaft, said bracket having a cylindrica supporting rod, a bear- 1% mg support in which said rod is mounted,

and means for clamping the rod in said support so that said rod may be adjusted endwise for shifting the looper for varying the Width of the over seam, and said rod may be adjusted about its longitudinal axis for tilting the bracket for shifting the path of 0scillation of the looper relative tothe path of the needle.

In testimony whereof, I aflix my signature. FRIEDRICH LUTZ.

July 2, 1929. e. MATTHEWS TOASTING DEVICE Filed Oct. 26, 1927 I n I I I n umrioz mid G Mafrhew 

